I found that with a little taller front tire I was more consistant parking the car in the beams which made my RT's more consistant. But a short tire does make a big differance in how fast you leave. IMHO
you can stage and be just as consistent you just have to learn the car... what you gain by a tall front tire is rollout... the amount of time your moving before the beam is tripped and your time starts... BUT YOUR ALREADY MOVING!!